Implementation of a finite element damage model for rock
A continuum damage model based on the mechanics of microcrack growth has been implemented in the finite element code SANCHO. The model incorporates the effects of the nucleation, growth and coalescence of microcracks under compressive loading. The material subroutine keeps track of both the magnitude and direction of microcrack growth in each element so that the induced anisotropy due to crack growth in preferred directions and the stress history dependence of microcrack growth are properly taken into account. In addition, the model allows for interaction among neighboring microcracks which leads to coalescence and subsequent material failure or softening. A damage vector, which is calculated from the crack distribution in each element, is used as an internal variable to compute the effective elastic moduli at each stage of the deformation. Several sample calculations using the model with material parameters chosen to represent Westerly granite were performed to demonstrate the model's capability and to investigate problems where structural failure occurs in a controlled manner.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 7144721
- Report Number(s):
- SAND-86-0074C; CONF-870103-5; ON: DE86014152
- Country of Publication:
- United States
- Language:
- English
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